Discharge Lamp and Method for Producing a Discharge Lamp

Abstract

A discharge lamp having a discharge vessel ( 2 ) that comprises at least one bulb neck ( 21, 22 ), into which are fused a holding rod ( 6 ) extending into the discharge space ( 3 ) for an electrode ( 4, 5 ), a carrier part ( 10 ) on which at least one current-carrying element ( 9 ) is arranged, a support element ( 7 ) enclosing the holding rod ( 6 ) and a tube ( 13 ) enclosing the carrier part ( 10 ) with the current-carrying element. The tube ( 13 ) encloses the support element ( 7 ) over a partial length (L 3 ) which is less than the total length (L) of the support element ( 7 ).

1 . A discharge lamp having a discharge vessel that comprises at least one bulb neck, into which are fused a holding rod extending into the discharge space for an electrode, a carrier part on which at least one current-carrying element is arranged, a support element enclosing the holding rod and a tube enclosing the carrier part with the current-carrying element, wherein the tube encloses the support element over a partial length which is less than the total length of the support element. 
   
   
       2 . The discharge lamp as claimed in  claim 1 , wherein the support element extends out of the tube with a length of more than 2.5 mm. 
   
   
       3 . The discharge lamp as claimed in  claim 1 , wherein the inner diameter of the tube before fusing in is greater than the outer diameter of the carrier part with the current-carrying element arranged on it, and less than this outer diameter plus approximately 3 mm. 
   
   
       4 . The discharge lamp as claimed in  claim 1 , wherein the wall thickness of the tube is between 1.8 mm and 4.5 mm. 
   
   
       5 . The discharge lamp as claimed in  claim 1 , wherein the tube surrounds the carrier part, and the current-carrying element arranged on it, over a partial length which is less than the total length of the carrier part. 
   
   
       6 . The discharge lamp as claimed in  claim 1 , wherein the support element comprises a first subelement which at least at one position has an outer diameter greater than the inner diameter of the tube at the end facing the support element. 
   
   
       7 . The discharge lamp as claimed in  claim 1 , wherein the first subelement at least at one position has an outer diameter which is greater than or equal to the outer diameter of the tube at the end facing the support element. 
   
   
       8 . The discharge lamp as claimed in  claim 1 , wherein the support element comprises a frustoconical first subelement and a cylindrical second subelement. 
   
   
       9 . The discharge lamp as claimed in  claim 8 , wherein the transition between the first subelement and the second subelement following it is formed in a stepped fashion. 
   
   
       10 . The discharge lamp as claimed in  claim 8 , wherein the outer diameter of the second subelement is less than the inner diameter of the tube at the end of the tube facing the support element. 
   
   
       11 . The discharge lamp as claimed in  claim 8 , wherein the tube surrounds the support element at most over the length of the second subelement. 
   
   
       12 . A method for producing a discharge lamp, in which a discharge vessel having at least one bulb neck is formed, and into which said bulb neck are fused a holding rod for the electrode, a carrier part on which at least one current-carrying element is arranged, a support element enclosing the holding rod and a tube enclosing the carrier part with the current-carrying element, wherein the tube is fused in so that it encloses the support element over a partial length which is less than the total length of the support element. 
   
   
       13 . The method as claimed in  claim 12 , wherein the support element before fusing in is arranged so that it extends out of the tube with a length of more than 2.5 mm. 
   
   
       14 . The method as claimed in  claim 12 , wherein the tube before fusing in is provided with an inner diameter which is greater than the outer diameter of the carrier part with the current-carrying element arranged on it, and less than this outer diameter plus approximately 3 mm.